quote from VL400 on the delcohacking boards:
wonder if he wasn't using a FT232 chip?The 808 is a custom MCU and does not offer the same options. You have these choices with register 4004...
; SS0 SS1 BAUD RATE
; 1 1 256
; 0 1 1024
; 1 0 8192
; 0 0 32768
I have tried 32k baud (12P has selectable baud rate since v1.02) but its very unreliable - being a non-standard baud rate the divisors dont get close enough and you run errors.
according to FTDI:
3,000,000 / 32,768 = 91.552734375The FT232R supports all standard baud rates and non-standard baud rates from 183 Baud up to 3 Mbaud. Achievable non-standard baud rates are calculated as follows -
Baud Rate = 3000000 / (n + x)
where n can be any integer between 2 and 16,384 and x can be a sub-integer of the value 0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, or 0.875.
When n = 1, x = 0, i.e. baud rate divisors with values between 1 and 2 are not possible.
the closest we can achieve is therefore 91.5. that's an error of .0576%.... that's well within tolerance.
now i'm kind of curious to see if this all actually works. logging at 4X normal speed would probably be largely pointless, but i wouldn't complain about ~44Hz full stream datalogging.
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Originally Posted by 1project2many
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